Docus - minor bugs

• 1.installation.md : GitHub Template -> button "Create a repo with the Docus starter" redirect on github page error 404.
• 1.pre-launch.md : On input placeholder "Your mail" invisible.
• 5.deployment.md : Missing valid emote line 3 "🪶".

[farnabaz]

Hey @DespauxGuillaume, Thank you for the issue 👍

Docus Starter repository is private and it cause the 404 error

Do you have any suggestion on emote for deployment?

I think 🐣 will be good (hatching_chick)

[atinux]

I think 🚀 (:rocket:) could work for deployment